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Utility-Controlled EV Charging shapes who builds charging stations as utilities, regulators, and private networks compete over infrastructure, grid upgrades, and pricing, impacting ratepayers, competition, and EV adoption across states seeking cleaner transport.

Key Points

Utility-controlled EV charging is utilities building charging networks affecting rates, competition and grid costs.

✅ Regulated investment may raise rates before broader savings.

✅ Private firms warn monopolies stifle competition and innovation.

✅ Regulators balance access, equity, and grid upgrade needs.

Electric vehicles are widely seen as the automobile industry’s future, but a battle is unfolding in states across America over who should control the charging stations that could gradually replace fuel pumps.

From Exelon Corp. to Southern California Edison, utilities have sought regulatory approval to invest millions of dollars in upgrading their infrastructure as state power grids adapt to increased charging demand, and, in some cases, to own and operate chargers.

The proposals are sparking concerns from consumer advocates about higher electric rates and oil companies about subsidizing rivals. They are also drawing opposition from startups that say the successors to gas stations should be open to private-sector competition, not controlled by monopoly utilities.

That debate is playing out in regulatory commissions throughout the U.S. as states and utilities promote wider adoption of electric vehicles. At stake are charging infrastructure investments expected to total more than $13 billion over the next five years, as an American EV boom accelerates, according to energy consulting firm Wood Mackenzie. That would cover roughly 3.2 million charging outlets.

Calvin Butler Jr., who leads Exelon’s utilities business, said many states have grown more open to the idea of utilities becoming bigger players in charging as electric vehicles have struggled to take off in the U.S., where they make up only around 2% of new car sales.

“When the utilities are engaged, there’s quicker adoption because the infrastructure is there,” he said.

Major auto makers including General Motors Co. and Ford Motor Co. are accelerating production of electric vehicles, and models like Tesla’s Model 3 are shaping utility planning, and a number of states have set ambitious EV goals—most recently California, which aims to ban the sale of new gasoline-powered cars by 2035. But a patchy charging-station network remains a huge impediment to mass EV adoption.

Democratic presidential candidate Joe Biden has called for building more than 500,000 new public charging outlets in a decade as part of his plan to combat climate change, amid Biden’s push to electrify the transportation sector. But exactly how that would happen is unclear. The U.S. currently has fewer than 100,000 public outlets, according to the Energy Department. President Trump, who has weakened federal tailpipe emissions targets, hasn’t put forward an electric-vehicle charging plan, though he backed a 2019 transportation bill that would have provided $1 billion in grants to build alternative fueling infrastructure, including for electric vehicles.

Charging access currently varies widely by state, as does utility involvement, with many utilities bullish course on EV charging to support growth, which can range from providing rebates on home chargers to preparing sites for public charging—and even owning and operating the equipment needed to juice up electric vehicles.

As of September, regulators in 24 states had signed off on roughly $2.6 billion of utility investment in transportation electrification, according to Atlas Public Policy, a Washington, D.C., policy firm. More than half of that spending was authorized in California, where electric vehicle adoption is highest.

Nearly a decade ago, California blocked utilities from owning most charging equipment, citing concerns about potentially stifling competition. But the nation’s most populous state reversed course in 2014, seeking to spur electrification.

Regulators across the country have since been wrestling with similar questions, generating a patchwork of rules.

Maryland regulators signed off last year on a pilot program allowing subsidiaries of Exelon and FirstEnergy Corp. to own and operate public charging stations on government property, provided that the drivers who use them cover at least some of the costs.

Months later, the District of Columbia rejected an Exelon subsidiary’s request to own public chargers, saying independent charging companies had it covered.

Some charging firms argue utilities shouldn’t be given monopolies on car charging, though they might need to play a role in connecting rural customers and building stations where they would otherwise be uneconomical.

“Maybe the utility should be the supplier of last resort,” said Cathy Zoi, chief executive of charging network EVgo Services LLC, which operates more than 800 charging stations in 34 states.

Utility charging investments generally are expected to raise customers’ electricity bills, at least initially. California recently approved the largest charging program by a single utility to date: a $436 million initiative by Southern California Edison, an arm of Edison International, as the state also explores grid stability opportunities from EVs. The company said it expects the program to increase the average residential customer’s bill by around 50 cents a month.

But utilities and other advocates of electrification point to studies indicating greater EV adoption could help reduce electricity rates over time, by giving utilities more revenue to help cover system upgrades.

Proponents of having utilities build charging networks also argue that they have the scale to do so more quickly, which would lead to faster EV adoption and environmental improvements such as lower greenhouse gas emissions and cleaner air. While the investments most directly help EV owners, “they accrue immediate benefits for everyone,” said Jill Anderson, a Southern California Edison senior vice president.

Some consumer advocates are wary of approving extensive utility investment in charging, citing the cost to ratepayers.

“It’s like, ‘Pay me now, and maybe someday your rates will be less,’” said Stefanie Brand, who advocates on behalf of ratepayers for the state of New Jersey, where regulators have yet to sign off on any utility proposals to invest in electric vehicle charging. “I don’t think it makes sense to build it hoping that they will come.”

Groups representing oil-and-gas companies, which stand to lose market share as people embrace electric vehicles, also have criticized utility charging proposals.

“These utilities should not be able to use their monopoly power to use all of their customers’ resources to build investments that definitely won’t benefit everybody, and may or may not be economical at this point,” said Derrick Morgan, who leads federal and regulatory affairs at the American Fuel & Petrochemical Manufacturers, a trade organization.

Utility executives said their companies have long been used to further government policy objectives deemed to be in the public interest, drawing on lessons from 2021 to guide next steps, such as improving energy efficiency.

“This isn’t just about letting market forces work,” said Mike Calviou, senior vice president for strategy and regulation at National Grid PLC’s U.S. division.

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Harbour Air Electric Aircraft Project advances zero-emission aviation with CleanBC Go Electric ARC funding, converting seaplanes to battery-electric power, cutting emissions, enabling commercial passenger service, and creating skilled clean-tech jobs through R&D and electrification.

Key Points

Harbour Air's project electrifies seaplanes with CleanBC ARC support to enable zero-emission flights and cut emissions.

✅ $1.6M CleanBC ARC funds seaplane electrification retrofit

✅ Target: passenger-ready, zero-emission commercial service

✅ Creates 21 full-time clean-tech jobs in British Columbia

B.C.’s Harbour Air Seaplanes is building on its work in clean technology to decarbonize aviation, part of an aviation revolution underway, and create new jobs with support from the CleanBC Go Electric Advanced Research and Commercialization (ARC) program.

”Harbour Air is decarbonizing aviation and elevating the company to new altitudes as a clean-technology leader in B.C.'s transportation sector,” said Bruce Ralston, Minister of Energy, Mines and Low Carbon Innovation. “With support from our CleanBC Go Electric ARC program, Harbour Air's project not only supports our emission-reduction goals, but also creates good-paying clean-tech jobs, exemplifying the opportunities in the low-carbon economy.”

Harbour Air is receiving almost $1.6 million from the CleanBC Go Electric ARC program for its aircraft electrification project. The funding supports Harbour Air’s conversion of an existing aircraft to be fully electric-powered and builds on its successful December 2019 flight of the world’s first all-electric commercial aircraft, and subsequent first point-to-point electric flight milestones.

That flight marked the start of the third era in aviation: the electric age. Harbour Air is working on a new design of the electric motor installation and battery systems to gain efficiencies that will allow carrying commercial passengers, as it eyes first electric passenger flights in 2023. Approximately 21 full-time jobs will be created and sustained by the project.

“CleanBC is helping accelerate world-leading clean technology and innovation at Harbour Air that supports good jobs for people in our communities,” said George Heyman, Minister of Environment and Climate Change Strategy. “Once proven, the technology supports a switch from fossil fuels to advanced electric technology, and will provide a clean transportation option, such as electric ferries, that reduces pollution and shows the way forward for others in the sector.”

Harbour Air is a leader in clean-technology adoption. The company has also purchased a fully electric, zero-emission passenger shuttle bus to pick up and drop off passengers between Harbour Air’s downtown Vancouver and Richmond locations, and the Vancouver International Airport, where new EV chargers support travellers.

“It is great to see the Province stepping up to support innovation,” said Greg McDougall, Harbour Air CEO and ePlane test pilot. “This type of funding confirms the importance of encouraging companies in all sectors to focus on what they can be doing to look at more sustainable practices. We will use these resources to continue to develop and lead the transportation industry around the world in all-electric aviation.”

In total, $8.18 million is being distributed to 18 projects from the second round of CleanBC Go Electric ARC program funding. Recipients include Damon Motors and IRDI System, both based on the Lower Mainland. The 15 other successful projects will be announced this year.

The CleanBC Go Electric ARC program supports the electric vehicle (EV) sector in B.C., which leads the country in going electric, by providing reliable and targeted support for research and development, commercialization and demonstration of B.C.-based EV technologies, services and products.

“This project is a great example of the type of leading-edge innovation and tech advancements happening in our province,” said Brenda Bailey, Parliamentary Secretary for Technology and Innovation. “By further supporting the development of the first all-electric commercial aircraft, we are solidifying our position as world leaders in innovation and using technology to change what is possible.”

The CleanBC Roadmap to 2030 is B.C.’s plan to expand and accelerate climate action, including a major hydrogen project, building on the province’s natural advantages – abundant, clean electricity, high-value natural resources and a highly skilled workforce. It sets a path for increased collaboration to build a British Columbia that works for everyone.

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Canada Coal Phase-Out Costs highlight Fraser Institute findings on renewable energy, wind and solar integration, grid reliability, natural gas backup, GDP impacts, greenhouse gas emissions reductions, nuclear alternatives, and transmission upgrades across provincial electricity systems.

Key Points

Costs to replace coal with renewables, impacting taxpayers and ratepayers while ensuring grid reliability.

✅ Fraser Institute estimates $16.8B-$33.7B annually for renewables.

✅ Emissions cut from coal phase-out estimated at only 7.4% nationally.

✅ Natural gas backup and grid upgrades drive major cost increases.

Replacing coal-fired electricity with renewable energy will cost Canadian taxpayers and hydro ratepayers up to $33.7 billion annually, with only minor reductions in global greenhouse gas emissions linked to climate change, according to a new study by the Fraser Institute.

The report, Canadian Climate Policy and its Implications for Electricity Grids by University of Victoria economics professor G. Cornelis van Kooten, said replacing coal-fired electricity with wind and solar power would only cut Canada’s annual emissions by 7.4%,

Prime Minister Justin Trudeau’s has promised a reduction of 40%-45% compared to Canada’s 2005 emissions by 2030, and progress toward the 2035 clean electricity goals remains uncertain.

The study says emission cuts would be relatively small because coal accounted for only 9.2% of Canada’s electricity generation in 2017. (According to Natural Resources Canada, that number is lower today at 7.4%).

In 2019, the last year for which federal data are available, Canada’s electricity sector generated 8.4% of emissions nationally — 61.1 million tonnes out of 730 million tonnes.

“Despite what advocates, claim, renewable power — including wind and solar — isn’t free and, as Europe's power crisis lessons suggest, comes with only modest benefits to the environment,” van Kooten said.

“Policy makers should be realistic about the costs of reducing greenhouse gas emissions in Canada, which accounts for less than 2% of emissions worldwide.”

The report says the increased costs of operating the electricity grid across Canada — between $16.8 billion and $33.7 billion annually or 1% to 2% of Canada’s annual GDP — would result from having to retain natural gas, consistent with net-zero regulations allowing some natural gas in limited cases, as a backup to intermittent wind and solar power, which cannot provide baseload power to the electricity grid on demand.

Van Kooten said his cost estimates are conservative because his study “could not account for scenarios where the scale of intermittency turned out worse than indicated in our dataset … the costs associated with the value of land in other alternative uses, the need for added transmission lines, as analyses of greening Ontario's grid costs indicate, environmental and human health costs and the life-cycle costs of using intermittent renewable sources of energy, including costs related to the disposal of hazardous wastes from solar panels and wind turbines.”

If nuclear power was used to replace coal-fired electricity, the study says, costs would drop by half — $8.3 billion to $16.7 billion annually — but that’s unrealistic because of the time it takes to build nuclear plants and public opposition to them.

The study says to achieve the federal government’s target of reducing emissions to 40% to 45% below 2005 levels by 2030 and net-zero emissions by 2050, would require building 30 nuclear power plants before 2030, highlighting Canada’s looming power problem as described by analysts — meaning one plant of 1,000-megawatt capacity coming online every four months between now and 2030.

Alternatively, it would take 28,340 wind turbines, each with 2.5-megawatts capacity, or 1,050 turbines being built every four months, plus the costs of upgrading transmission infrastructure.

Van Kooten said he based his calculations on Alberta, which generates 39.8% of its electricity from coal and the cost of Ontario eliminating coal-fired electricity, even as Ontario electricity getting dirtier in coming years, which generated 25% of its electricity, between 2003 and 2014, replacing it with a combination of natural gas, nuclear and wind and solar power.

According to Natural Resources Canada, Nova Scotia generates 49.9% of its electricity from coal, Saskatchewan 42.9%, and New Brunswick 17.2%.

In 2018, the Trudeau government announced plans to phase-out traditional coal-fired electricity by 2030, though the Stop the Shock campaign seeks to bring back coal power in some regions. 

Canada and the U.K. created the “Powering Past Coal Alliance” in 2017, aimed at getting other countries to phase out the use of coal to generate electricity.

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Condo EV charging retrofits face strata approval thresholds, installation costs, and limited electrical capacity, but government rebates, subsidies, and smart billing systems can improve ROI, property value, and feasibility amid electrician shortages and infrastructure constraints.

Key Points

Condo EV charging retrofits equip multiunit parking with EV chargers, balancing costs, bylaws, capacity, and rebates.

✅ Requires owner approval (e.g., 75% in B.C.) and clear bylaws

✅ Leverage rebates, subsidies, and load management to cut costs

✅ Plan billing, capacity, and phased installation to increase ROI

Retrofitting an existing multiunit residential building with electric vehicle charging stations is a complex and costly exercise, as high-rise EV charging challenges in MURBs demonstrate, even after subsidies, but the biggest hurdle to adoption may be getting enough condo owners on board.

British Columbia, for example, offers a range of provincial government subsidies to help condo corporations (referred to in B.C. as stratas) with everything from the initial research to installing the chargers. But according to provincial strata law, three-quarters of owners must support the plan before it is implemented, though new strata EV legislation could make approvals easier in some jurisdictions.

“The largest challenge is getting that 75-per-cent majority approval to go ahead,” says EV charging specialist Patrick Breuer with ChargeFwd Ltd., a Vancouver-based sustainable transport consultancy.

Chris Brunner, a strata president in Vancouver, recently upgraded all the building’s parking stalls for EV charging. His biggest challenge was getting the strata’s investment owners, who don’t live in the building and were not interested in spending money, to support the project.

“We had to sell it in two ways,” Mr. Brunner says. “First, that there’s going to be a return on investment, including vehicle-to-building benefits that support savings and grid stability, and second, that there will come a time when this will be required. And if we do it now, taking advantage of the generous rebates and avoiding price increases for expertise and materials, we’ll be ahead of the curve.”

Once the owners have voted in favour, the condo board can begin the planning process and start looking for rebates. The B.C. government will provide a rebate of up to 75 per cent for the consulting phase, with additional provincial rebates available through current programs. It’s referred to as an “EV Ready” plan, which is a professionally prepared document that describes how to implement EV charging fairly, and estimates its cost.

Once a condo has completed the EV Ready plan, it becomes eligible for other rebates, such as the EV Ready Infrastructure subsidy, which will bring power to each individual parking stall through an energized outlet. This is rebated at 50 per cent of expenses, up to $600 a stall.

There are further rebates of up to 75 per cent for installing the charging stations themselves, and B.C. charging rebates extend to home and workplace programs, too. The program is administered by BC Hydro, a Crown corporation that receives funding in annual increments. “Right now, it’s funded until March 31, 2023,” Mr. Breuer says.

“Realtors are valuing [individual charging stations] from $2,000 to $10,000,” he said. The demand for installing EV chargers in buildings has grown to such an extent that it’s hard to find qualified electricians, Mr. Breuer says.

However, even with subsidies, there are some buildings where it doesn’t make financial sense to retrofit them. “If you have to core through thin floors or there’s a big parkade with a large voltage drop, it isn’t financially viable,” Mr. Breuer says. “We do a lot of EV Ready plans, but not all the projects can go ahead.”

For many people, it’s resistance to the unknown that is preventing them from voting for the retrofit, according to Carter Li of Toronto-based Swtch Energy Inc., which provides charging in high-density urban settings. It has done retrofits on 200 multiunit residential buildings in the Toronto area, and Calgary condo charging efforts show similar momentum in other cities, too. “They’re worried about paying for someone else’s electricity,” he says. Selling owners on the idea requires educating them about how the billing will work, maximizing electrical capacity to keep costs down, using government subsidies and the anticipated boost in property value.

Ontario currently does not provide any subsidies for retrofitting condos for EV charging. However, there is a stipulation under the Condominium Act that if owners request EV charging be installed and provide a condo board with sufficient documentation, an assessment will be conducted.

When Jeremy Benning was on the board of his Toronto condo in 2018, a few residents inquired about installing EV charging. A committee of owners did the legwork, and found a company that could do the infrastructure installation as well as set up accounts for individual billing purposes. Residents were surveyed a number of times before going ahead with the installation.

Mr. Benning estimates it cost about $40,000 to install two electrical subpanels to accommodate EV chargers in 20 parking spaces. Although the condo corporation paid the money up front out of its operating budget, everyone who ordered a charger will pay back their share over time. Many who do not even own an EV have opted to add a valuable frill to their unit.

The board considered applying for a subsidy from Natural Resources Canada, but it would require a public charger in the visitor parking lot. “The rebate wasn’t enough to pay for the cost of putting in that charging station,” Mr. Benning says. “Also, you have to maintain it, and what if it gets vandalized? It wasn’t worth it.”

Quebec’s Roulez Vert (Ride Green) program offers extensive provincial rebates and incentives for retrofitting condo buildings. If a single condo owner wants to install an EV charger, the government will refund up to 50 per cent of the installation cost or up to $5,000, whichever is less.

Otherwise, a property manager can qualify for a maximum of $25,000 a year to retrofit a building and can sometimes complete the work in stages. “They may do the first installation in one year, and then continue the next year,” says Léo Viger-Bernard of Recharge Véhicule Électrique (RVE). Recently, the Quebec government confirmed this program will run until 2027.

RVE consults with condo corporations, operates an online platform (murby.com) with resources for building owners, and sells a demand charge controller (DCC), which is an electric vehicle energy management system. The DCC allows an electrician to plug the EV charger directly into the electrical infrastructure of a single condo or apartment unit. Not only does this reduce extra wiring, but it also monitors the electrical consumption in each unit, only powering the charging station when there’s available electricity. Billing is assigned to the actual unit’s electricity bill.

Currently there are about 12,000 DCC units installed in retrofitted buildings across Canada, some that are 40 or 50 years old. “It’s not a question of age; it’s more the location of the electric meters,” Mr. Viger-Bernard says. The DCC can be installed either on the roof or on different floors.

According to Michael Wilk, president of Montreal-based Wilkar Property Management Inc., the biggest barrier is getting condo owners to understand the necessity of doing a retrofit now, as opposed to waiting. He uses price increases to try to convince them.

“Right now, the cost of doing a retrofit is 35 per cent more than it was two years ago,” he says. “If you wait another two years, we can only anticipate it’s going to be 35 per cent higher because of the rising cost of labour, parts and equipment.”

In Nova Scotia, Marc MacDonald of Spark Power Corp. installed an EV charger with a DCC unit at a condo near Halifax about a year ago. “They only had space in their electrical room to add a device for up to 10 EV chargers,” he says. The condo board was hesitant, demanding a great deal of information. “They were concerned about everyone wanting an EV charger.”

Now that Nova Scotia has introduced a program for rebates and incentives to install EV chargers in condos, on-street sites and more, Mr. MacDonald anticipates demand will increase, though Atlantic EV adoption still lags the national average. “But they’ll have to settle with reality. Not everyone can have an EV charger if the building can’t accommodate it.”

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California Iron-Air Battery Storage Project delivers 100-hour long-duration energy storage, supported by a $30 CEC grant, using Form Energy technology at a PG&E substation to boost grid reliability, integrate renewables, and cut fossil reliance.

Key Points

California's 5 MW/500 MWh iron-air battery delivers 100-hour discharge, boosting reliability and renewable integration.

✅ 5 MW/500 MWh iron-air system at a PG&E substation

✅ 100-hour multiday storage enhances grid reliability

✅ CEC $30M grant backs non-lithium, long-duration tech

The California Energy Commission (CEC) has given the green light to a $30 million grant to Form Energy for the construction of an extraordinary long-duration energy storage project that will offer an unparalleled 100 hours of continuous grid discharge.

This ambitious endeavor involves the development of a 5-megawatt (MW) / 500 megawatt-hour iron-air battery storage project, representing the largest long-duration energy storage initiative in California. It also marks the state's inaugural utilization of this cost-effective technology, and joins ongoing procurements by utilities such as San Diego Gas & Electric to expand storage capacity statewide. The project's location is set at a substation owned by the Pacific Gas and Electric Company in Mendocino County, where it will supply power to local residents. The system is scheduled to commence operation by the conclusion of 2025, contributing to grid reliability and showcasing solutions aligned with the state's climate and clean energy objectives.

CEC Chair David Hochschild commented, "A multiday battery system is transformational for California's energy mix. This project will enhance our ability to harness excess renewables during nonpeak hours for use during peak demand, especially as we work toward a goal of 100 percent clean electricity."

This grant award represents one of three approvals within the framework of the CEC's Long-Duration Energy Storage program, a part of Governor Gavin Newsom's historic multi-billion-dollar commitment to combat climate change. This program fosters investment in the demonstration of non-lithium-ion technologies across the state, including green hydrogen microgrids, contributing to the creation of a diverse portfolio of energy storage technologies.

As of August, California had 6,600 MW of battery storage actively deployed statewide, a trend mirrored in regions like Ontario as well, operating within the prevailing industry standard of 4 to 6 hours of discharge. By year-end, this figure is projected to expand to 8,600 MW. Longer-duration storage, spanning from 8 to 100 hours, holds the potential to expedite the state's shift away from fossil fuels while reinforcing grid stability. California estimates that more than 48 gigawatts (GW) of battery storage and 4 GW of long-duration storage will be requisite to achieve the objective of 100 percent clean electricity by 2045.

Energy storage serves as a cornerstone of California's clean energy future, offering a means to capture and store surplus power generated by renewable resources, including emerging virtual power plant models that aggregate distributed assets. The state's battery infrastructure plays a pivotal role during the summer when electricity demand peaks in the early evening hours as solar resources decline, preceding the later surge in wind energy.

Iron-air battery technology operates on the principle of reversible rusting. These battery cells contain iron and air electrodes and are filled with a water-based, nonflammable electrolyte solution. During discharge, the battery absorbs oxygen from the air, converting iron metal into rust. During the charging phase, the application of an electrical current converts the rust back into iron, releasing oxygen. This technology is cost-competitive compared to lithium-ion battery production and complements broader clean energy BESS initiatives seen in New York.

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Thermoradiative Diode Power leverages infrared radiation and night-sky cooling to harvest waste heat. Using MCT (mercury cadmium telluride) detectors with photovoltaics, it extends renewable energy generation after sunset, exploiting radiative cooling and low-power density.

Key Points

Technology using MCT infrared diodes to turn radiative Earth-to-space heat loss into electricity, aiding solar at night.

✅ MCT diodes radiate to cold sky, generating tiny current at 20 C

✅ Complements photovoltaics by harvesting post-sunset infrared flux

✅ Potential up to one-tenth solar output with further efficiency gains

Conventional solar technology soaks up rays of incoming sunlight to bump out a voltage. Strange as it seems, some materials are capable of running in reverse, producing power as they radiate heat back into the cold night sky environment.

A team of engineers in Australia has now demonstrated the theory in action, using the kind of technology commonly found in night-vision goggles to generate power, while other research explores electricity from thin air concepts under ambient humidity.

So far, the prototype only generates a small amount of power, and is probably unlikely to become a competitive source of renewable power on its own – but coupled with existing photovoltaics technology and thermal energy into electricity approaches, it could harness the small amount of energy provided by solar cells cooling after a long, hot day's work.

"Photovoltaics, the direct conversion of sunlight into electricity, is an artificial process that humans have developed in order to convert the solar energy into power," says Phoebe Pearce, a physicist from the University of New South Wales.

"In that sense, the thermoradiative process is similar; we are diverting energy flowing in the infrared from a warm Earth into the cold Universe."

By setting atoms in any material jiggling with heat, you're forcing their electrons to generate low-energy ripples of electromagnetic radiation in the form of infrared light, a principle also explored with carbon nanotube energy harvesters in ambient conditions.

As lackluster as this electron-shimmy might be, it still has the potential to kick off a slow current of electricity. All that's needed is a one-way electron traffic signal called a diode.

Made of the right combination of elements, a diode can shuffle electrons down the street as it slowly loses its heat to a cooler environment.

In this case, the diode is made of mercury cadmium telluride (MCT). Already used in devices that detect infrared light, MCT's ability to absorb mid-and long-range infrared light and turn it into a current is well understood.

What hasn't been entirely clear is how this particular trick might be used efficiently as an actual power source.

Warmed to around 20 degrees Celsius (nearly 70 degrees Fahrenheit), one of the tested MCT photovoltaic detectors generated a power density of 2.26 milliwatts per square meter.

Granted, it's not exactly enough to boil a jug of water for your morning coffee. You'd probably need enough MCT panels to cover a few city blocks for that small task.

But that's not really the point, either, given it's still very early days in the field, and there's potential for the technology to develop significantly further in the future.

"Right now, the demonstration we have with the thermoradiative diode is relatively very low power. One of the challenges was actually detecting it," says the study's lead researcher, Ned Ekins-Daukes.

"But the theory says it is possible for this technology to ultimately produce about 1/10th of the power of a solar cell."

At those kinds of efficiencies, it might be worth the effort weaving MCT diodes into more typical photovoltaic networks alongside thin-film waste heat solutions so that they continue to top up batteries long after the Sun sets.

To be clear, the idea of using the planet's cooling as a source of low-energy radiation is one engineers have been entertaining for a while now. Different methods have seen different results, all with their own costs and benefits, with low-cost heat-to-electricity materials also advancing in parallel.

Yet by testing the limits of each and fine-tuning their abilities to soak up more of the infrared bandwidth, we can come up with a suite of technologies and thermoelectric materials capable of wringing every drop of power out of just about any kind of waste heat.

"Down the line, this technology could potentially harvest that energy and remove the need for batteries in certain devices – or help to recharge them," says Ekins-Daukes.

"That isn't something where conventional solar power would necessarily be a viable option."

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